Updating to Cocos2d 2.1

I've updated Cocos2d to 2.1 version. This update breaks a lot of projects because they changed the ivars naming. 

In commit 15713b01cc88ddf35b2db88dd659bbdc200e5d9c are the important changes to the project. With 2.1, calling glBlendFuncSeparate makes the background turn black, sometimes blinks before turning completely black. Removing that line seems to solve the issue. I do not have the knowledge to explain why.

Here is a snapshot showing the project with the glBlendFuncSeparate function call.
![captura de pantalla 2013-10-01 a la s 2 52 30](https://f.cloud.github.com/assets/1373685/1243101/bc99420a-2a5d-11e3-87ae-ebb736d458a7.png)